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Merge pull request #55606 from Lion-Wei/proxier-1

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Automatic merge from submit-queue (batch tested with PRs 55606, 59185, 58763, 59072, 59251). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

make ipvs 'cleanupIptablesLeftovers' simplier

Since there are only four iptables chains in ipvs mode, no need to restore all chains when cleanup iptables chain created by ipvs.

**What this PR does / why we need it**:
Make ipvs `cleanupIptablesLeftovers` function much simplier.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #56689 

**Special notes for your reviewer**:

**Release note**:
```release-note
NONE
```
This commit is contained in:
Kubernetes Submit Queue 2018-02-02 18:26:32 -08:00 committed by GitHub
commit 6c23b920b7
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1 changed files with 21 additions and 39 deletions
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60
pkg/proxy/ipvs/proxier.go
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@ -79,6 +79,15 @@ const (
DefaultDummyDevice = "kube-ipvs0"
)
// tableChainsWithJumpService is the iptables chains ipvs proxy mode used.
var tableChainsWithJumpService = []struct {
table utiliptables.Table
chain utiliptables.Chain
}{
{utiliptables.TableNAT, utiliptables.ChainOutput},
{utiliptables.TableNAT, utiliptables.ChainPrerouting},
}
var ipvsModules = []string{
"ip_vs",
"ip_vs_rr",
@ -768,7 +777,6 @@ func CanUseIPVSProxier(handle KernelHandler, ipsetver IPSetVersioner) (bool, err
return true, nil
}
// TODO: make it simpler.
// CleanupIptablesLeftovers removes all iptables rules and chains created by the Proxier
// It returns true if an error was encountered. Errors are logged.
func cleanupIptablesLeftovers(ipt utiliptables.Interface) (encounteredError bool) {
@ -777,14 +785,7 @@ func cleanupIptablesLeftovers(ipt utiliptables.Interface) (encounteredError bool
"-m", "comment", "--comment", "kubernetes service portals",
"-j", string(kubeServicesChain),
}
tableChainsWithJumpServices := []struct {
table utiliptables.Table
chain utiliptables.Chain
}{
{utiliptables.TableNAT, utiliptables.ChainOutput},
{utiliptables.TableNAT, utiliptables.ChainPrerouting},
}
for _, tc := range tableChainsWithJumpServices {
for _, tc := range tableChainsWithJumpService {
if err := ipt.DeleteRule(tc.table, tc.chain, args...); err != nil {
if !utiliptables.IsNotFoundError(err) {
glog.Errorf("Error removing pure-iptables proxy rule: %v", err)
@ -806,30 +807,18 @@ func cleanupIptablesLeftovers(ipt utiliptables.Interface) (encounteredError bool
}
// Flush and remove all of our chains.
iptablesData := bytes.NewBuffer(nil)
if err := ipt.SaveInto(utiliptables.TableNAT, iptablesData); err != nil {
glog.Errorf("Failed to execute iptables-save for %s: %v", utiliptables.TableNAT, err)
encounteredError = true
} else {
existingNATChains := utiliptables.GetChainLines(utiliptables.TableNAT, iptablesData.Bytes())
natChains := bytes.NewBuffer(nil)
natRules := bytes.NewBuffer(nil)
writeLine(natChains, "*nat")
// Start with chains we know we need to remove.
for _, chain := range []utiliptables.Chain{kubeServicesChain, kubePostroutingChain, KubeMarkMasqChain, KubeServiceIPSetsChain} {
if _, found := existingNATChains[chain]; found {
chainString := string(chain)
writeLine(natChains, existingNATChains[chain]) // flush
writeLine(natRules, "-X", chainString) // delete
for _, chain := range []utiliptables.Chain{kubeServicesChain, kubePostroutingChain} {
if err := ipt.FlushChain(utiliptables.TableNAT, chain); err != nil {
if !utiliptables.IsNotFoundError(err) {
glog.Errorf("Error removing ipvs Proxier iptables rule: %v", err)
encounteredError = true
}
}
writeLine(natRules, "COMMIT")
natLines := append(natChains.Bytes(), natRules.Bytes()...)
// Write it.
err = ipt.Restore(utiliptables.TableNAT, natLines, utiliptables.NoFlushTables, utiliptables.RestoreCounters)
if err != nil {
glog.Errorf("Failed to execute iptables-restore for %s: %v", utiliptables.TableNAT, err)
encounteredError = true
if err := ipt.DeleteChain(utiliptables.TableNAT, chain); err != nil {
if !utiliptables.IsNotFoundError(err) {
glog.Errorf("Error removing ipvs Proxier iptables rule: %v", err)
encounteredError = true
}
}
}
return encounteredError
@ -1724,16 +1713,9 @@ func (proxier *Proxier) linkKubeServiceChain(existingNATChains map[utiliptables.
if _, err := proxier.iptables.EnsureChain(utiliptables.TableNAT, kubeServicesChain); err != nil {
return fmt.Errorf("Failed to ensure that %s chain %s exists: %v", utiliptables.TableNAT, kubeServicesChain, err)
}
tableChainsNeedJumpServices := []struct {
table utiliptables.Table
chain utiliptables.Chain
}{
{utiliptables.TableNAT, utiliptables.ChainOutput},
{utiliptables.TableNAT, utiliptables.ChainPrerouting},
}
comment := "kubernetes service portals"
args := []string{"-m", "comment", "--comment", comment, "-j", string(kubeServicesChain)}
for _, tc := range tableChainsNeedJumpServices {
for _, tc := range tableChainsWithJumpService {
if _, err := proxier.iptables.EnsureRule(utiliptables.Prepend, tc.table, tc.chain, args...); err != nil {
return fmt.Errorf("Failed to ensure that %s chain %s jumps to %s: %v", tc.table, tc.chain, kubeServicesChain, err)
}